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Fluid Power Practice Problems
Directions
Answer the following questions. Sketch each, then label all known values. Be sure to include all steps and units throughout each solution.
All problems assume that conditions are ideal. Forces such as friction are not considered.
Problems
A pneumatic system is producing 100 lb/in.2 of gauge pressure. A cylinder is needed to press an adhesive label onto a product. It has been determined that 5 lb of force is optimal to complete this task.
Sketch and label all known and unknown values.
Sketch
What is the required area of the pneumatic cylinder?
FormulaSubstitute / SolveFinal Answer
What is the required diameter of the pneumatic cylinder?
FormulaSubstitute / SolveFinal Answer
A hydraulic lift system utilizes two 3 in. diameter cylinders. Workers must determine how much the system is capable of lifting before deciding how much weight can be lifted safely. The system runs at a gauge pressure of 2000 lb/in.2.
Sketch and label all known and unknown values.
Sketch
What is the area of each piston?
FormulaSubstitute / SolveFinal Answer
How much is the system capable of lifting?
FormulaSubstitute / SolveFinal Answer
The gauge pressure of a pneumatic cylinder reads 20 lb/in.2 when the volume is 30 in.3. The cylinder is compressed until the gauge reads 60 lb/in.2. Assume standard atmospheric pressure (14.7 psi).
Sketch and label all known and unknown values.
Sketch
What is the absolute pressure before and after the cylinder gas is compressed?
FormulaSubstitute / SolveFinal Answer
FormulaSubstitute / SolveFinal Answer
What is the volume in the cylinder after the gas is compressed?
FormulaSubstitute / SolveFinal Answer
The air temperature in a 28 in.3 container with a free sliding piston is initially measured at 45 F. The temperature is raised to 200 F. What is the new volume of the container?
Sketch and label all known and unknown values.
Sketch
What are the absolute temperature readings initially and after the temperature has been raised?
FormulaSubstitute / SolveFinal Answer
FormulaSubstitute / SolveFinal Answer
What is the volume in the cylinder after the temperature has been raised?
FormulaSubstitute / SolveFinal Answer
A 60 ft3 compressor tank container has a gauge pressure of 160 lb/in.2 and a temperature of 70 F. The temperature after some time decreases to 40 F. Find the final pressure in the tank. Assume standard atmospheric pressure.
Sketch and label all known and unknown values.
Sketch
What are the absolute temperature readings initially and after the temperature decreases?
FormulaSubstitute / SolveFinal Answer
FormulaSubstitute / SolveFinal Answer
What is the absolute pressure of the system before the temperature decreases?
FormulaSubstitute / SolveFinal Answer
What is the absolute pressure of the system after the temperature decreases?
FormulaSubstitute / SolveFinal Answer
A flow meter is attached in a hydraulic line that measures 12 gal/min. The line has an inside diameter of 1.5 in. Find the flow velocity where the fluid passes the meter.
Sketch and label all known and unknown values.
Sketch
What is the flow rate measured as in.3 /min at the meter?
FormulaSubstitute / SolveFinal Answer
What is the area of inside diameter of the line?
FormulaSubstitute / SolveFinal Answer
What is the flow velocity where the fluid passes the meter?
FormulaSubstitute / SolveFinal Answer
A hydraulic press must be used to press-fit two components together in an assembly process. The system must generate at least 775 lb of force to perform the press fit. The piston at the input cylinder is pushed with a force of 250 lb and has an area of 30 in.2. The output can use up to 15 cylinders that are each 30 in.2. How many cylinders are needed?
Sketch and label all known and unknown values.
Sketch
How much mechanical advantage is required to gain the necessary force?
FormulaSubstitute / SolveFinal Answer
How many output cylinders must be incorporated into the design?
2012 Project Lead The Way, Inc.
Principles of Engineering Lesson 3.2 Fluid Power Practice Problems Page PAGE 1
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